Carriage-spring.



Nd. 718,704. PATENTE-D JAN. 20, 1903. 'T. B. IDOWSLEY.

CARRIAGE SPRING.

APPLIUATION FILED MAY-24, 1902.

2 SHEETS-SHEET 1.

NO MODEL.

UNITE STATES THOMAS B. DOWSLEY, OF OWEN SOUND, CANADA, ASSIGNOR TO TIMOTHY CHARLES I-IATTON, OF OWEN SOUND, ONTARIO, CANADA.

CARRIAGE-SPRING.

SPECIFICATION forming part of Letters Patent No. 718,704, dated January 20, 1903.

Application filed May 24:, 1902. Serial No- 108,8'70. (No model.)

To (ZZZ whom, it may concern:

Be it known that I, THOMAS BUROHILL DOWSLEY, manufacturer, of Owen Sound,in the county of Grey and Province of Ontario,

Canada, have invented certain new and useful Improvements in Carriage-Springs; and I hereby declare that the following is a full, clear, and exact description of the same.

In my Patent No. 533,057 I have shown and described a carriage-spring having a hollow head, with a cavity at one side thereof, into v which are inserted the ends of the upper and lower spring-plates, the spring-plates being held therein by a bolt passing through the head and through a bore formed in the ends of the spring-plates.

The present invention relates to an improvement on the construction shown and described in the above patent whereby the upper main spring-plate can be rigidly secured to the hollow heads without the use of a bolt or other auxiliary fastening medium and the lower main springplate loosely contained therein to movably bear against the upper main spring-plate and enable the upper and lower main spring-plates to reinforce each other when responding to the flexions of the carriage-spring.

In carrying out the present invention I em- 0 ploy a hollow head of any suitable design and size, having an opening at one side thereof in the end-s of which are longitudinally-disposed grooves terminating in laterally disposed grooves at the inner end of the opening to receive the'side and end edges, respectively, of

the spring-plates, which when inserted in the cavity are adapted to snugly fit into the said grooves and prevent the displacement of the hollow heads from the spring-plates, as here- 40 inafter more fully set forth, and more particularly pointed out in the claims.

In the drawings, Figure 1 is a perspective view of the carriage-spring. Fig. 2 is a longitudinal section of the hollow head and a por- 5 tion of the upper and lower main and supplementary spring-plates. Fig. 3 is a transverse sectional view of the construction shown in Fig. 2. Fig. 4 is a longitudinal section of a modification of the construction shown in Fig.

2. Fig. 5 is a transverse sectional view of the construction shown in Fig. 4. Fig. 6 is a perspective view of the hollow head and a portion of the upper and lower main and supplementary spring-plates. Figs. 7 and 8 are views of the upper spring-plate and hollow head, respectively, showing the interlocking serrations.

Like letters of reference refer to like parts throughout the specification and drawings.

The hollow head a is fitted with a cavity 1), having an opening 0 at one side thereof for the reception of the end of the upper and lower main spring-plates d and e,respectively. At the sides of the cavity 17 are longitudinallydisposed groovesf and g for the side edges of the upper and lower main spring-plates d and 6, respectively, the groovesfandgconverging toward the inner end of the cavity and terminating in the laterally-disposed grooves h and 9), into which are adapted to enter the end edgesof the upper and lower spring-plates d and 6, respectively. Separating the longitudinally disposed groovesfand g is a rib j, and separating the upper and lower laterallydisposed grooves 77, and dis a rib It. By means 7 5 of the ribsj and 76 the upper and lower main spring-plates d and e are held relatively to each other in the cavity and are allowed to bear against each other only at their extreme inner ends. The hollow head a is fitted with 80 an extension L, having a longitudinally disposed groove min its inner face to receive the inner end of the upper supplementary spring-plate 0, which is held in position in the groove by the outward pressure of the main spring-plate d. The lower supplementary spring-plate p is inserted into the cavity b between the lower spring-plate e and the contiguous part of the hollow head a, the supplementary spring plate 19 being retained therein by the normal outward pressure of the lower main spring-plate e. As shown in Fig. 2 of the drawings, a cushioned washer q is interposed between the inner end of the lower main spring-plate e and inner end of 5 the cavity 1), the inner edge of the cushioningwasher being contained in the lower laterallydisposed groove 71. During the fiexions of the carriage-spring the upper and lower main and supplementary spring-plates are compressed roe toward each other under the influence of the load, which causes them to straighten out and bring their inner ends into contact to reinforce each other under the strains thereof. The compression of the spring causes the inner ends of the lower main spring-plate to forcibly contact with the cushioning-washers g, which not only receive and cushion the end thrust movement of the lower main springplate, but also prevent its inner ends grinding on the inner ends of the upper main springplate.

The constant use of the spring would ultimately cause the ends of the lowermain spring-plate to cut the cushioning-washers to pieces, and to prevent the possibility of such a contingency I insert a metallic protectingplate between each end of the lower main spring-plate and the adjacent cushioningwasher to receive the end thrust of the lower main spring-plate and impart it to the cushioning-washer.

In fitting the parts together the inner faces of the longitudinally-disposed groovesfand g and the side edges of the ends of the upper main spring-plate are roughened or serrated, as at g, the upper longitudinal grooves having corresponding serrations g" to cause a perfect union of the heads and plate, the heads then being expanded by heat and placed on the ends of the upper main spring-plate, the ends of the supplementary spring-plate 0 being at the same time inserted into the groove m of the extension Z, the heads then being swaged or contracted thereon. When the heads have been seen red to the main and supplementary spring-plates, the cushioningwashers g are inserted in the lower laterallydisposed grooves of the cavities, and the lower main and supplementary spring-plates are bent and placed therein, the natural straightening of which causes them to retain their position in the hollow heads. By this means I am able to dispense with the use of all auxiliary locking devices-such as bolts, rivets, &c.ordinaril y used to hold the spring-plates to the hollow heads, and by doing so am able to produce a carriage-spring having a maximum of flexibility and resiliency. 7

Having thus fully described myinvention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a carriage-spring, the combination of a spring-plate, a hollow head having a cavity with an opening at one side thereof, in which is contained the end of the spring-plate and which is adapted to be shrunk thereon and caused to interlock therewith to prevent the removal of the spring-plate therefrom and a second spring-plate having its end loosely contained in the cavity to respond to the flexions of the spring.

2. In a carriage-spring, a hollow head having a cavity with an opening at one side thereof, and longitudinally-disposed grooves with serrated surfaces, formed at the sides of said opening and laterally-disposed grooves at the inner end of said cavity, in combination with the upper spring-plate having serrated sides contained in the upper longitudinally-disposed grooves, and its inner end contained in the upper laterally-disposed groove, the hollow head being shrunk on the said upper spring-plate to cause the interlocking of the serrations, and a lower spring-plate loosely contained in the hollow head, the side edges of which are contained in the lower longitudinally-disposed grooves, and its inner end in the lower laterally-disposed groove.

Owen Sound, May 9, A. D. 1902.

T. B; DOWSLEY.

In presence of- W. J. I-IATToN, J. I. FERGUSON. 

